introduced wxICON_DEFAULT_TYPE and wxBITMAP_DEFAULT_TYPE; documented these default argument values; matched the wxBitmap and wxIcon interfaces to their real implementations; revised icon.h interface header

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55777 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/icon.h

@@ -18,10 +18,6 @@
 // wxIcon
 //-----------------------------------------------------------------------------
 
-#ifndef wxICON_DEFAULT_BITMAP_TYPE
-#define wxICON_DEFAULT_BITMAP_TYPE wxBITMAP_TYPE_XPM
-#endif
-
 class WXDLLIMPEXP_CORE wxIcon: public wxBitmap
 {
 public:
@@ -35,7 +31,7 @@ public:
     // For compatibility with wxMSW where desired size is sometimes required to
     // distinguish between multiple icons in a resource.
     wxIcon( const wxString& filename,
-            wxBitmapType type = wxICON_DEFAULT_BITMAP_TYPE,
+            wxBitmapType type = wxICON_DEFAULT_TYPE,
             int WXUNUSED(desiredWidth)=-1, int WXUNUSED(desiredHeight)=-1 ) :
         wxBitmap(filename, type)
     {
@@ -46,6 +42,10 @@ public:
     {
     }
 
+    bool LoadFile(const wxString& name, wxBitmapType flags = wxICON_DEFAULT_TYPE,
+                  int WXUNUSED(desiredWidth)=-1, int WXUNUSED(desiredHeight)=-1)
+        { return LoadFile(name, flags); }
+
     // create from bitmap (which should have a mask unless it's monochrome):
     // there shouldn't be any implicit bitmap -> icon conversion (i.e. no
     // ctors, assignment operators...), but it's ok to have such function